Annual report pursuant to Section 13 and 15(d)

Royalty Obligation (Details)

v3.20.4
Royalty Obligation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
Royalty obligation $ 15.0 $ 8.2
Royalty obligation discount rate 10.30% 12.00%
Royalty obligation increase in period $ 6.8